For below types
type HFunc = (Int :: String :: HNil) => Int
type Func = (Int, String) => Int
I try to convert Func
to HFunc
val funExpr: Tree = ???
val hlistType = ???
val hfuncName = c.freshName("hfunc")
q"""
def $hfuncName(t: $hlistType) = {
${funExpr}(..) //how to extract hlist elements as params ?
}
"""
How Can I extract the HList
elements and pass it to the Func
?
If all you want is the conversion (and not necessarily macro), shapeless provides these out of the box as extension methods on functions:
import shapeless._
import shapeless.syntax.std.function._
type HFunc = (Int :: String :: HNil) => Int
type Func = (Int, String) => Int
def toHFunc(f: Func): HFunc = f.toProduct
def fromHFunc(hf: HFunc): Func = hf.fromProduct
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